Changing The Setpoint - ABB i-bus KNX Product Manual


ABB i-bus KNX
Planning and application
4.9.1

Changing the setpoint

Depending on the intended purpose of the room or area, e.g. training or competition areas in sports halls,
it may be useful to apply a changeable setpoint (control parameter) for the constant lighting control via the
KNX. The communication object Control parameter is provided for this purpose.
Commissioning with artificial lighting and daylight calibration is implemented initially using the brightness
(setpoint 1), which is most frequently used with normal operation. Hereby, the characteristic of the lighting
is recorded by the DALI Light Controller and stored to ensure optimum light control. For the second
brightness value (setpoint 2), the Actual value must be determined again exclusively with artificial lighting.
Procedure
If this has not already been undertaken, the lighting group of the DALI Light Controller is calibrated with
the brightness setpoint (1) used primarily during operation. A detailed procedure is described in
page 173. The Actual value (control parameter) for setpoint 1 is read using the light controller section in
the Software Tool. This value has to be written to the communication object Control parameter when
changing to setpoint 1. This can, for example, be implemented with the assistance of a button or
visualization.
In order to determine the second setpoint brightness (2), the room is also darkened and the brightness
is set exclusively using artificial lighting only. The Actual value (control parameter) for the second
setpoint is read again using the controller in the Software-Tool. This value has to be written to the
communication object Control parameter when changing to setpoint 2. This can, for example, be
implemented with the assistance of a button or visualization.
1.
2.
3.
4.
5.
6.
1)
Interference of the artificial lighting calibration caused by daylight has the effect that the DALI Light Controller assumes that
the illumination can produce a larger brightness level than is actually the case. The light controller will set a lower level of
brightness in control operation.
Determine the setpoint and set it via KNX (using the example of lighting group
Configuration
Deactivate lighting control.
Slaves must be actively
integrated into the control.
Darken the room.
Set the artificial lighting so
that the setpoint brightness
is set to the reference point.
Read control parameter.
Set control parameter for
setpoint via KNX.
By
Send 0 to communication object Activate
function controller (No. 31).
Alternatively, this can be done with the
corresponding button in the Software-
Tool.
Write the corresponding communication
objects Activate function slave with a 1.
Blind or time of day.
Dimming via communication object
Relative dimming (No. 34).
The control parameter (actual value) is to
be read via external Software Tool
Write communication object Control
parameter (No. 41) by a pushbutton or
visualization with previously read control
parameter (actual value), see point 6.
1)
)
Effect
Lighting control is deactivated/stopped.
The entire lighting that should be
effective in the lighting control is
activated during calibration.
Brightness in the detection range of the
light sensor less than 20 lx1).
Setpoint is set, e.g. 500 lx.
Lux meter is positioned vertically below
the light sensor.
In a perfectly controlled circuit, the
actual value is equal to the setpoint
and can be used as a control
parameter. Control difference equal to
zero.
The control parameter for the new
setpoint is stored in the DALI Light
Controller for the controller lighting
group and used with lighting control.
DLR/A 4.8.1.1 | 2CDC507128D0202 171